[Nouveau] [Bug 46557] nouveau: nv4E 2D acceleration broken on 64-bit kernel; works on 32-bit

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=46557

--- Comment #15 from D. Hugh Redelmeier <hugh at mimosa.com> 2012-06-17 09:02:34 PDT ---
Thinking some more.  Some inconclusive evidence that this is not a hardware
bug: 64-bit Ubuntu worked fine on it with 3G of RAM.  So to does the MS Windows
Vista.  This surely included DMAing into the high 1G by disk I/O, DVD writer
I/O, and video driver I/O.

What's new is nouveau.  Perhaps it uses part of the video controller that nv
and Vista do not, part that does defective DMA, but that isn't obvious to me.

(Note: I'm using "DMA" in the computer architecture sense, not the IBM PC clone
sense.)

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